netdev - Re: [PATCH 3/8] dt-bindings: net: bluetooth: Add rtl8723bs-bluetooth

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Date:   Tue, 19 Feb 2019 09:56:47 +0100
From:   Stefan Wahren <stefan.wahren@...e.com>
To:     Vasily Khoruzhick <anarsoul@...il.com>,
        Rob Herring <robh@...nel.org>
Cc:     Mark Rutland <mark.rutland@....com>,
        devicetree <devicetree@...r.kernel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        netdev@...r.kernel.org, Marcel Holtmann <marcel@...tmann.org>,
        linux-bluetooth@...r.kernel.org, Chen-Yu Tsai <wens@...e.org>,
        "David S. Miller" <davem@...emloft.net>,
        arm-linux <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 3/8] dt-bindings: net: bluetooth: Add rtl8723bs-bluetooth

Hi Vasily,

Am 18.02.19 um 22:24 schrieb Vasily Khoruzhick:
> On Mon, Feb 18, 2019 at 1:10 PM Rob Herring <robh@...nel.org> wrote:
>> On Fri, Jan 18, 2019 at 09:02:27AM -0800, Vasily Khoruzhick wrote:
>>> Add binding document for bluetooth part of RTL8723BS/RTL8723CS
>>>
>>> Signed-off-by: Vasily Khoruzhick <anarsoul@...il.com>
>>> ---
>>>  .../bindings/net/rtl8723bs-bluetooth.txt      | 35 +++++++++++++++++++
>>>  1 file changed, 35 insertions(+)
>>>  create mode 100644 Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt
>>>
>>> diff --git a/Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt b/Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt
>>> new file mode 100644
>>> index 000000000000..8357f242ae4c
>>> --- /dev/null
>>> +++ b/Documentation/devicetree/bindings/net/rtl8723bs-bluetooth.txt
>>> @@ -0,0 +1,35 @@
>>> +RTL8723BS/RTL8723CS Bluetooth
>>> +---------------------
>>> +
>>> +RTL8723CS/RTL8723CS is WiFi + BT chip. WiFi part is connected over SDIO, while
>>> +BT is connected over serial. It speaks H5 protocol with few extra commands
>>> +to upload firmware and change module speed.
>>> +
>>> +Required properties:
>>> +
>>> + - compatible: should be one of the following:
>>> +   * "realtek,rtl8723bs-bt"
>>> +   * "realtek,rtl8723cs-bt"
>>> +Optional properties:
>>> +
>>> + - device-wake-gpios: GPIO specifier, used to wakeup the BT module (active high)
>>> + - enable-gpios: GPIO specifier, used to enable the BT module (active high)
>>> + - host-wake-gpios: GPIO specifier, used to wakeup the host processor (active high)
>>> + - firmware-postfix: firmware postfix to be used for firmware config
>> How is this used?
> rtl8723bs-bt needs 2 firmware binaries -- one is actual firmware,
> another is firmware config which is specific to the board. If
> firmware-postfix is specified, driver appends it to the name of config
> and requests board-specific config while loading firmware. I.e. if
> 'pine64' is specified as firmware-postfix driver will load
> rtl8723bs_config-pine64.bin.

this is a common problem (e.g. brcmfmac has the same problem [1]).

Why not using the "model" property instead of inventing a new software
specific property?

[1] - https://patchwork.kernel.org/patch/10764463/

>
>> Rob
>>
> _